Heating-furnace



T. R. RENWIGK.

HEATING FURNACE.

Patenteept. 23, 1884.

flLTNESSES dud INVENTOR THOMAS R. RENWIOK, OF GRAND RAPIDS, MICHIGAN.

HEATING-FURNACE.

SPECIFICATION forming part of Letters Patent No. 305,477, dated September 23 1884-.

Application filed Mayl, 1883. (N model.)

. To all whom it may concern Be it known that I, THOMAS E. RnNwIcK, of the city of Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful Improvements in Heating-Furnaces, of which the following is a specification.

My invention relates to that class of heatingfurnaces in which the heat is conveyed from a boiler to the radiating pipes or coils by means of heated water; and the object of my invention is to economically use as much as possible of the heat generated by the combustion of the fuel in the furnace, and preventthe great waste of heat which usually escapes through the smoke-pipe or chimney. This object I accomplish by means of the mechanism illustrated in the accompanying drawings, in which- Figure 1 is a longitudinal sectional view on the line '1, Fig. 2, of a furnace and boiler constructed in accordance with my invention. Fig. 2 is a plan View of the boiler when constructed saddle-shaped. Fig. 3 is a cross-section of the boiler and smoke-flue on the line 00 a, when the boiler is saddle shaped. This figure also shows the perspective inside of the flue. Fig. 4 is a cross-section of the boiler and flue on the same line, was, when the boiler is a thin, fiat, inclosed pan, which form from my experiments I think preferable.

Similar letters refer to similar parts throughout the several views.

A represents the boiler, which in Figs. 2 and 3 is shown saddle-shaped, and in Fig. 4. rectangular. The boiler is placed immediately above the fire-box F and flue N. The under side of the boiler Ais higher at the end over the fire-box than at the other end, it in-- clining downward to the chimney. In case of the saddle-shaped boiler, the lower side of the boiler forms the top and sides of the flue, which decreases in size as it proceeds from the firebox to the smoke-pipe or chimney E. When the flat boiler is used, the under side of the boiler inclines downward from the fire-box to the chimney, and the side walls of the flue may or may not be contracted so as to decrease the flue. The flame and hot air from the burning fuel rises from the firebox and impinges directly against the bottom of the boiler, and the bottomof the boiler being on an incline it does not cease to act upon it until it finally leaves the flue. Beneath the firebox F is the ash-pan M. At or near the lower end of the boiler is the inlet-pipe O, and at or near the upper end of theboiler is the outlet-pipe B.

Attached in any suitlength of the radiating-coils it again enters the boiler, more or less cooled, at 0. Thus a continuous current of water is kept up from the lower end of the boiler to the upper end, as shown by the arrows. \Vhile the water is passing in an upward current from the lower to the upper end of the boiler, immediately beneath and in contact with the boiler in the flue, a current of flame and heated air is passing in the opposite direction, asshown by the arrows, in the flue. The :lire being placed under the upper end of the boiler A, the highest temperature or greatest heat is at this point, and the heat gradually decreases as it proceeds toward the lower end; hence the coolest water enters the boiler at the point where there is the least heat under the boiler and immediately begins to take heat from the warmth beneath. As the water passes up toward the upper end of the boiler the heat increases and the water increases in temperature, until it reaches the highest initial point of heat, when it passesout pipe B into the coils. There isno point in the boiler, from the time that the water enters at C until it leaves at B that it is not taking up heat from the fire beneath. I

I am aware that in hot-water furnaces the water has been heated in inclined pipes among which the products of combustion and the heated air from the fire-box pass, the arrangeat the lower ends of the pipes, whereas withv my construction of boiler and its arrangement all of the products of combustion and of the heated air must necessarily pass along the en- IO tire length of the boiler, thus utilizing the heat of the furnace to the maximum extent and insuring a constant and gradual increase in the temperature of the water in the boiler from the lower to the upper end of the same.

15 I therefore do not broadly claim, in combination with the other parts of the apparatus, an 7 inclined boiler; but

What I do claim is 1. The combination, with afire-box, a chim- 2o ney, .a flue inclining downward from said fire-' box to said chimney, and a boiler of substantially'the character shown and described, in-

clining downward from the fire-box to the 2 s I I 305,477

by the water entering the boiler at the lower end passes upward toward the upper, end of the boiler, while the fiame and heated air pass downward in the opposite direction in contact with the boiler, the current of water being in one direction and the current of heated air in the opposite direction, substantially as described.

2. The flat-thin boiler located above and forming one side of the flue N, and inclining downward from the fire-box F to the chimney E, in combination with the fire-box F, pipes B and O, and coil D, all constructed as de- I scribed. THOMAS H. RENWIOKr Witnesses: I

FRED W. STEVENS,

LAUREN N. RENwIoK. 

